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Hey yall. just wondering if anyone has measured the ID of the headers, and pipe. I saw a post about the slip on ID and it was 32mmbut that is stretched so it slips over. what I am looking for is the ID of the headers etc. as I will get a set made but need to specify the right size. plus I want to go 1/4" bigger just to free it up a bit more

thanks everyone
 

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Think the original poster is talking about the header pipes that connect to the cylinder head. Stock exhaust system for mine is sitting in the spare parts pile, so it's easy to measure. The inside diameter measured at the cylinder head connection is 25.5mm but part of that is a weld bead between the pipe and the flange; the pipe itself might be a smidge more. The slip-on connection is about 28.5mm inside diameter and 37.5mm outside diameter including the thick gasket that the slip-on slips over.
 
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